Machine tool



FIG. 1 shows a front view of the design;

FIG. 2 shows a side view of the design from one side;

FIG. 3 shows a side view of the design from the other side;

FIG. 4 shows a top view of the design;

FIG. 5 shows a backside view of the design;

FIG. 6 shows a perspective view of the design; and,

FIG. 7 shows a perspective view of the design with lowered working reservoir.

The broken lines in the drawings depict unclaimed environmental subject matter. 

The ornamental design for a machine tool, as shown and described. 